高速开关阀非定常磁场的有限元计算  

FEM Analysis of Transient Magnetic in High-speed On-off Valve

作　　者：田静[1] 

机构地区：[1]中国民航学院机电工程学院,天津300300

出　　处：《中国民航学院学报》2002年第6期25-29,共5页Journal of Civil Aviation University of China

摘　　要：高速开关阀滞后的主要原因是电感元件存在滞后,这很容易通过加一个高电压产生过电流而去磁得到补偿。由于磁场存在涡电流,因此限制了阀的快速性的提高,而且阻碍磁力线渗入电磁铁。采用先进的有限元方法,得到了电流和磁通量的瞬态特性,以及磁力线渗入电磁铁的瞬态过程,从而得到涡电流对高速开关阀的影响。通过过电流去磁和使用低导电材料可以降低高速开关阀的滞后。Main delay of high-speed on-off valve results usually from the t im e -constant of solenoid-in ductance.It is compensated easily by energizing the solenoid with a high-voltage over-excitation cir cuit.However the quicker oper ation is prevented from the eddy-current in the magnetic cir cuit.It in terfer es to permeate magnetic flux into armature.This paper clari-fies the effect of eddy current on the switching speed of on-off solenoid by measuring the transi ent characteristics of the electric cur rent and magnetic flux-flow,and by ca lculating transient flux-flow on the process of perme ating into the armature w ith the aid of new-ly-programmed FEM analysis.This paper condudes that over-ex citation energizing and low-con ductive ma te rial shorten the delay of a switch ing-solenoid valve.

关 键 词：非定常磁场 计算 高速开关阀 有限元方法 涡电流 控制方式 液压控制 

分 类 号：TH137.52[机械工程—机械制造及自动化]